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Finding the Fourth Proportional to 1,569.24, 2,351.81 and 643.75

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Solution

The fourth proportional to 1,569.24, 2,351.81 and 643.75 is: 964.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,569.24 : 2,351.81 = 643.75 : x
  2. Step 2: Convert to fraction form
    1,569.24/2,351.81 = 643.75/x
  3. Step 3: Cross multiply
    1,569.24x = 2,351.81 × 643.75
  4. Step 4: Simplify right side
    1,569.24x = 1,513,986.65
  5. Step 5: Solve for x
    x = 1,513,986.65/1,569.24
  6. Step 6: Final answer
    x = 964.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.